isupper(3)                          CLIX                          isupper(3)



  NAME

    isupper - Tests whether a character is uppercase

  LIBRARY

    Standard C Library (libc.a)

  SYNOPSIS

    #include <ctype.h>

    int isupper(
      int c );

  PARAMETERS

    c   An integer representing a character

  DESCRIPTION

    The isupper() macro tests for any uppercase letter as defined by the
    character set.  The isupper() macro is defined on valid members of the
    character set and on the single value EOF (guaranteed not to be a
    character set member.  See stdio.

    The classification macro isupper() does a table lookup.

  EXAMPLES

    To test if the character read from stdin is uppercase:

    #include <ctype.h>
    int c;
       .
       .
       .
    /* get a character from stdin */
    printf("enter a character:");
    c = getchar();

    /* check to see if a digit was read */
    if (isupper(c))
         printf("read an uppercase"\n);


  CAUTIONS

    If the argument to any character handling macro is not in the domain of
    the function, the result is undefined.




  2/94 - Intergraph Corporation                                              1

  isupper(3)                          CLIX                          isupper(3)



  RETURN VALUES

    The isupper() macro returns 0 for false and nonzero numbers for true.

  RELATED INFORMATION

    Commands:  chrtbl(1)

    Functions:  isdigit(3), isxdigit(3), islower(3), isalpha(3), isalnum(3),
    isspace(3), iscntrl(3), ispunct(3), isprint(3), isgraph(3), isascii(3),
    tolower(3), toupper(3), toascci(3), _tolower(3), _toupper(3),
    setchrclass(3), stdio(3)

    Miscellany:  environ(4)








































  2                                              Intergraph Corporation - 2/94